TL431AIDG

Overview

The TL431AIDG is a three-terminal programmable shunt regulator diode from onsemi, housed in an SOIC-8 package. It operates as a low temperature coefficient Zener reference programmable from Vref to 36 V using two external resistors. The device supports a cathode current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. It features a reference input voltage tolerance of ±1.0% and an equivalent full-range temperature coefficient of 50 ppm/°C. Operating ambient temperature ranges from -40 °C to +85 °C.

Feature Summary

• Programmable output voltage adjustable from the internal reference level up to 36 V via external resistor networks
• Temperature compensated for stable operation across the full rated industrial operating temperature range
• Low dynamic output impedance providing precise regulation characteristics suitable for precision applications

Applications

• Digital voltmeters requiring stable reference voltages
• Power supplies utilizing feedback control for driving optocouplers
• Op amp circuitry serving as positive or negative voltage references
• Series pass regulators and constant current sources

Procurement Notes

Verify the specific suffix 'D' confirms the SOIC-8 package configuration and lead-free status. Confirm the 'AI' marking code corresponds to the required ±1.0% tolerance and -40 °C to +85 °C temperature range. Ensure compatibility with surface mount assembly processes given the SMD/SMT installation style specified in the datasheet ordering information.

Selection Notes

Select this component when a precision shunt regulator with adjustable output is needed within the industrial temperature range. The ±1.0% initial accuracy distinguishes it from standard tolerance variants. Consider the SOIC-8 package dimensions for PCB layout constraints. Verify that the 100 mA sink current capability meets the circuit's maximum load requirements during regulation.

Part Context

This part belongs to the TL431A, B series of programmable precision references manufactured by onsemi. It serves as a monolithic IC voltage reference designed to replace traditional Zener diodes in various analog and digital circuits. The family includes variants with different tolerances and temperature ranges, such as the TL431B for tighter accuracy or NCV prefixes for automotive qualification.

Replacement Considerations

TL431BIDG offers 0.4% tolerance. TL431IDG provides 2.2% tolerance. NCV431AIDR2G is an automotive qualified alternative in tape and reel packaging.